Asus AAEON PICO-EHL4 User manual

Last Updated: December 21, 2021
PICO-EHL4
PICO-ITX Single Board Computer
User’s Manual 2nd Ed

Preface II
Pico-ITX Board PICO-EHL4
Copyright Notice
This document is copyrighted, 2021. All rights are reserved. The original manufacturer
reserves the right to make improvements to the products described in this manual at
any time without notice.
No part of this manual may be reproduced, copied, translated, or transmitted in any
form or by any means without the prior written permission of the original manufacturer.
Information provided in this manual is intended to be accurate and reliable. However,
the original manufacturer assumes no responsibility for its use, or for any infringements
upon the rights of third parties that may result from its use.
The material in this document is for product information only and is subject to change
without notice. While reasonable efforts have been made in the preparation of this
document to assure its accuracy, AAEON assumes no liabilities resulting from errors or
omissions in this document, or from the use of the information contained herein.
AAEON reserves the right to make changes in the product design without notice to its
users.

Preface III
Pico-ITX Board PICO-EHL4
Acknowledgement
All other products’ name or trademarks are properties of their respective owners.
Microsoft Windows® is a registered trademark of Microsoft Corp.
Intel® , Celeron® and Pentium® are registered trademarks of Intel Corporation
Intel Atom™ is a trademark of Intel Corporation
ITE is a trademark of Integrated Technology Express, Inc.
IBM, PC/AT, PS/2, and VGA are trademarks of International Business Machines
Corporation.
All other product names or trademarks are properties of their respective owners.
Omission of a product name from this list does not imply any claim to ownership by the
publisher of this document.

Preface IV
Pico-ITX Board PICO-EHL4
Packing List
Before setting up your product, please make sure the following items have been
shipped:
Item
Quantity
PICO-EHL4 MB
1
If any of these items are missing or damaged, please contact your distributor or sales
representative immediately.

Preface V
Pico-ITX Board PICO-EHL4
About this Document
This User’s Manual contains all the essential information, such as detailed descriptions
and explanations on the product’s hardware and software features (if any), its
specifications, dimensions, jumper/connector settings/definitions, and driver installation
instructions (if any), to facilitate users in setting up their product.
Users may refer to the product page on AAEON.com for the latest version of this
document.

Preface VI
Pico-ITX Board PICO-EHL4
Safety Precautions
Please read the following safety instructions carefully. It is advised that you keep this
manual for future references
1. All cautions and warnings on the device should be noted.
2. Make sure the power source matches the power rating of the device.
3. Position the power cord so that people cannot step on it. Do not place anything
over the power cord.
4. Always completely disconnect the power before working on the system’s
hardware.
5. No connections should be made when the system is powered as a sudden rush
of power may damage sensitive electronic components.
6. If the device is not to be used for a long time, disconnect it from the power
supply to avoid damage by transient over-voltage.
7. Always disconnect this device from any AC supply before cleaning.
8. While cleaning, use a damp cloth instead of liquid or spray detergents.
9. Make sure the device is installed near a power outlet and is easily accessible.
10. Keep this device away from humidity.
11. Place the device on a solid surface during installation to prevent falls
12. Do not cover the openings on the device to ensure optimal heat dissipation.
13. Watch out for high temperatures when the system is running.
14. Do not touch the heat sink or heat spreader when the system is running
15. Never pour any liquid into the openings. This could cause fire or electric shock.
16. As most electronic components are sensitive to static electrical charge, be sure to
ground yourself to prevent static charge when installing the internal components.
Use a grounding wrist strap and contain all electronic components in any
static-shielded containers.

Preface VII
Pico-ITX Board PICO-EHL4
17. If any of the following situations arises, please the contact our service personnel:
i. Damaged power cord or plug
ii. Liquid intrusion to the device
iii. Exposure to moisture
iv. Device is not working as expected or in a manner as described in
this manual
v. The device is dropped or damaged
vi. Any obvious signs of damage displayed on the device
18. DO NOT LEAVE THIS DEVICE IN AN UNCONTROLLED ENVIRONMENT WHERE
THE STORAGE TEMPERATURE IS BELOW -20°C (-4°F) OR ABOVE 60°C (140°F)
TO PREVENT DAMAGE.

Preface VIII
Pico-ITX Board PICO-EHL4
FCC Statement
This device complies with Part 15 FCC Rules. Operation is
subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any
interference received including interference that may cause
undesired operation.
Caution:
There is a danger of explosion if the battery is incorrectly replaced. Replace only with the
same or equivalent type recommended by the manufacturer. Dispose of used batteries
according to the manufacturer’s instructions and your local government’s recycling or
disposal directives.
Attention:
Il y a un risque d’explosion si la batterie est remplacée de façon incorrecte.
Ne la remplacer qu’avec le même modèle ou équivalent recommandé par le constructeur.
Recycler les batteries usées en accord avec les instructions du fabricant et les directives
gouvernementales de recyclage.

Preface IX
Pico-ITX Board PICO-EHL4
China RoHS Requirements (CN)
产品中有毒有害物质或元素名称及含量
AAEON Main Board/ Daughter Board/ Backplane
部件名称
有毒有害物质或元素
铅
(Pb)
汞
(Hg)
镉
(Cd)
六价铬
(Cr(VI))
多溴联苯
(PBB)
多溴二苯醚
(PBDE)
印刷电路板
及其电子组件
○
○
○
○
○
○
外部信号
连接器及线材
○
○
○
○
○
○
O：表示该有毒有害物质在该部件所有均质材料中的含量均在
SJ/T 11363-2006 标准规定的限量要求以下。
X：表示该有毒有害物质至少在该部件的某一均质材料中的含量超出
SJ/T 11363-2006 标准规定的限量要求。
备注：此产品所标示之环保使用期限，系指在一般正常使用状况下。

Preface X
Pico-ITX Board PICO-EHL4
China RoHS Requirement (EN)
Poisonous or Hazardous Substances or Elements in Products
AAEON Main Board/ Daughter Board/ Backplane
Component
Poisonous or Hazardous Substances or Elements
Lead
(Pb)
Mercury
(Hg)
Cadmium
(Cd)
Hexavalent
Chromium
(Cr(VI))
Polybrominated
Biphenyls
(PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
PCB & Other
Components
O
O
O
O
O
○
Wires &
Connectors
for External
Connections
O
O
O
O
O
O
O：The quantity of poisonous or hazardous substances or elements found in each of the
component's parts is below the SJ/T 11363-2006-stipulated requirement.
X: The quantity of poisonous or hazardous substances or elements found in at least one of the
component's parts is beyond the SJ/T 11363-2006-stipulated requirement.
Note: The Environment Friendly Use Period as labeled on this product is applicable under normal
usage only

Preface XI
Pico-ITX Board PICO-EHL4
Table of Contents
Chapter 1 - Product Specifications.......................................................................................... 1
1.1 Specifications............................................................................................................ 2
1.2 Function Block Diagram......................................................................................... 5
Chapter 2 –Hardware Information ....................................................................................... 6
2.1 Dimensions ............................................................................................................... 7
2.2 Jumpers and Connectors.......................................................................................8
2.3 List of Jumpers ........................................................................................................10
2.3.1 Clear CMOS Jumper, Auto Power Button Selection (JP1)...............10
2.4 List of Connectors................................................................................................... 11
2.4.1 RTC Battery Connector (CN1) ..............................................................12
2.4.2 LVDS Back Light Inverter (CN2)...........................................................12
2.4.3 LVDS/eDP (Reserved) (CN3) ................................................................12
2.4.4 Dual HDMI Connector (CN4)...............................................................14
2.4.5 Dual LAN Connector (CN5) .................................................................16
2.4.6 SATA Port (CN6)......................................................................................17
2.4.7 +5V SATA Power Connector (CN7).....................................................17
2.4.8 DIO 4-bit Header (CN8)........................................................................18
2.4.9 USB2.0/ USB3.2 Dual Port (Port 1/ Port 2) (CN9) ............................18
2.4.10 USB2.0 Dual Port Header (CN10)........................................................19
2.4.11 mSATA/ Mini Card Slot (CN11) ............................................................20
2.4.12 M.2 E-Key Slot (CN12) ..........................................................................22
2.4.13 CAN Bus Dual Port Header (CN13)....................................................25
2.4.14 COM Dual Port Header (CN15) ..........................................................25
2.4.15 SPI Port (CN17).......................................................................................26
2.4.16 eSPI/ SMBus/ I2C...................................................................................27
2.4.17 4-pin Smart Fan Connector (CN19)...................................................27

Preface XII
Pico-ITX Board PICO-EHL4
2.4.18 Power Input +12V (CN20)....................................................................28
2.4.19 Front Panel (CN21) ................................................................................28
2.4.20 DC Jack Power Input (Reserved) (CN22)..........................................28
2.4.21 RJ45 Connector (Reserved).................................................................29
2.5 Thermal Assembly Options .................................................................................30
2.5.1 Active Cooling Fan FAN01....................................................................30
2.5.2 Fan-less Heatspreader HSP01..............................................................31
2.5.3 Heatsink HSK01 (with Heatspreader).................................................32
Chapter 3 - AMI BIOS Setup ................................................................................................ 33
3.1 System Test and Initialization ..............................................................................34
3.2 AMI BIOS Setup .....................................................................................................35
3.3 Setup Submenu: Main..........................................................................................36
3.4 Setup Submenu: Advanced.................................................................................37
3.4.1 CPU Configuration................................................................................38
3.4.2 PCH-FW Configuration ........................................................................39
3.4.2.1 Firmware Update Configuration ...........................................40
3.4.3 Trusted Computing ................................................................................41
3.4.4 SATA Configuration...............................................................................43
3.4.5 SDIO Configuration...............................................................................44
3.4.6 Hardware Monitor.................................................................................45
3.4.6.1 Smart Fan Mode Configuration ............................................46
3.4.7 SIO Configuration .................................................................................47
3.4.7.1 Serial Port Configuration ........................................................48
3.4.8 Power Management .............................................................................49
3.4.9 Digital IO Port Configuration..............................................................50
3.5 Setup Submenu: Chipset ......................................................................................51
3.5.1 System Agent (SA) Configuration......................................................52
3.5.1.1 Memory Configuration...........................................................53

Preface XIII
Pico-ITX Board PICO-EHL4
3.5.1.2 Graphics Configuration...........................................................54
3.5.2 PCH-IO Configuration..........................................................................57
3.6 Setup Submenu: Security.....................................................................................58
3.6.1 Secure Boot ............................................................................................59
3.6.1.1 Key Management.....................................................................60
3.7 Setup Submenu: Boot ..........................................................................................62
3.8 Setup Submenu: Save & Exit...............................................................................63
Chapter 4 –Drivers Installation............................................................................................ 64
4.1 Drivers Download and Installation.....................................................................65
Appendix A –Mating Connectors ....................................................................................... 67
A.1 List of Mating Connectors and Cables..............................................................68
Appendix B - I/O Information .............................................................................................. 69
B.1 Direct Memory Access (DMA) Map...................................................................70
B.2 I/O Address Map ....................................................................................................71
B.3 IRQ Mapping Chart...............................................................................................72
B.4 Large Memory Map..............................................................................................83
B.5 Memory Address Map .........................................................................................84
Appendix C - Watchdog Timer Programming................................................................... 86
C.1 Introduction to Watchdog Timer .......................................................................87
C.2 Programing the Watchdog Timer with AAEON SDK.....................................88
C.3 Programing Watchdog Timer with AAEON Windows EAPI .........................89
C.3.1 Watchdog Timer Functions .................................................................90
C.3.1.1 EapiWDogGetCap() .................................................................90
C.3.1.2 EapiWDogStart() .......................................................................91
C.3.1.3 EapiWDogTrigger() ..................................................................92
C.3.1.4 EapiWDogStop().......................................................................92
C.3.1.5 EapiWDogReloadTimer()........................................................93
C.3.1.6 EapiWDogGetStatus()..............................................................93

Preface XIV
Pico-ITX Board PICO-EHL4
C.3.1.7 EapiWDogSetStatus() ..............................................................94

Pico-ITX Board PICO-EHL4
Chapter 1
Chapter 1 - Product Specifications

Chapter 1 –Product Specifications 2
Pico-ITX Board PICO-EHL4
1.1 Specifications
System
Form Factor
PICO-ITX
CPU
Intel® Atom™ x6000E series, Intel® Pentium
and Celeron® N and J series processors
Intel® Atom™ x6425RE (4C, 1.9GHz, TDP 12W)
Intel® Atom™ x6414RE (4C, 1.5GHz, TDP 9W)
Intel® Atom™ x6212RE (2C, 1.2GHz, TDP 6W)
Intel® Atom™ x6425E (4C, 1.8GHz, up to
3GHz, TDP 12W)
Intel® Atom™ x6413E (4C, 1.5GHz, up to
3GHz, TDP 9W)
Intel® Atom™ x6211E (2C, 1.2GHz, up to 3GHz,
TDP 6W)
Intel® Pentium® J6426 (4C, 1.8GHz, up to
3GHz, TDP 10W)
Intel® Pentium® N6415 (4C, 1.2GHz, up to
3GHz, TDP-up 6.5W)
Intel® Celeron® J6412 (4C, 1.8GHz, up to
3GHz, TDP 10W)
Intel® Celeron® J6210 (2C, 1.2GHz, up to
3GHz, TDP 6.5W)
(Intel® Atom™ x6427FE/x6200FE by request)
CPU Frequency
Up to 3 GHz
Chipset
Intel® Elkhart Lake SoC Processor
Memory Type
LPDDR4x 3200 MHz on board memory
Max. Memory Capacity
Up to 16 GB

Chapter 1 –Product Specifications 3
Pico-ITX Board PICO-EHL4
System
BIOS
AMI UEFI
Wake On LAN
Yes
Watchdog Timer
255 Levels
Power Requirement
+12V AT/ATX (default)
Power Supply Type
Lockable & Phoenix Terminal co-lay
Power Consumption (Typical)
Intel® Pentium® J6426, LPDDR4x onboard
8GB: 2.36A at +12V (balance), 2.81A at +12V
(max)
Intel® Atom™ x6425E, LPDDR4x onboard
16GB: 2.56A at +12V (balance), 2.81A at +12V
(max)
System Cooling
Heat-spreader, heatsink & cooler optional
Dimensions
3.94" x 2.84" (100mm x 72mm)
Gross Weight
0.55 lbs. (0.25 kg)
Operating Temperature
32°F ~ 140°F (0°C ~ 60°C)
Storage Temperature
-40°F ~ 176°F (-40°C ~ 80°C)
Operating Humidity
0% ~ 90% relative humidity, non-condensing
MTBF (Hours)
461,744
Certification
CE/FCC Class A
OS Support
Windows 10 (64 bit)
Ubuntu Linux (Version: TBC)

Chapter 1 –Product Specifications 4
Pico-ITX Board PICO-EHL4
Display
Chipset
Intel® Atom™ x6000E series, Intel® Pentium
and Celeron® N and J series processors
Resolution
HDMI2.0b x 2, 4K 60Hz
Single channel 12V/3.3V, 18/24-bit LVDS/eDP up
to 4K
LCD Interface
18/24-bit Single LVDS
I/O
Storage/SSD
eMMC x 1 (32/64/128 GB)
SATA III (6.0 Gbps) x 1
SATA Power (5V) x 1
Ethernet
RTL8111, 10/100/1000Base, RJ45 x 2
(Compatible with RJ45 x 1)
USB Port
2 x USB3.2 Gen 2 rear IO
2 x USB2.0 header
Serial Port
RS-232/422/485 x 2
Audio
—
DIO
4-bit
Expansion Slot
M.2 2230 E-key x 1 (for Wi-Fi/Bluetooth,
PCIe/USB signal only)
Mini PCIe (Full-Sized) x 1 (Default mSATA or
USB2.0, PCIe set by BIOS)
SMBUS/I2C + eSPI x 1 (SMBUS as default, I2C
selected by HW BOM)
CANBus x 2 (see note)
SIM
—
TPM
Intel® PTT (Integrated TPM)
Note: CANBus not supported by Celeron J6412 or Celeron N6210 processors.

Chapter 1 –Product Specifications 5
Pico-ITX Board PICO-EHL4
1.2 Function Block Diagram

Pico-ITX Board PICO-EHL4
Chapter 2
Chapter 2 –Hardware Information